[Live-devel] Parser and Framer

[Ross Finlayson]

>I have some enquiries regarding parser and framer function.
>
>A parser is used when the video/ audio data is a file and to split 
>the data into frames. If the encoder produces frames directly 
>instead of writing to a file, the parser can be skipped when 
>streaming. Is this true?

Yes.  This is the purpose of "MPEG1or2VideoStreamDiscreteFramer" and 
"MPEG4VideoStreamDiscreteFramer", for example.  (In practice, these 
classes will do a small amount of 'parsing' within each frame, to get 
timing information that's used to compute presentation times.  See 
the *DiscreteFramer classes for examples of this.  However, they 
won't need to do any parsing to actually find the start and end of 
each frame; that information is already given to them.

>
>A framer is to frame the frames produced by the encoder such that 
>they contained information like fFramesize, fPresentationTime. Is 
>this true.

Yes.
-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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